Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a1403dd2a114f8f…

MALICIOUS

PDF

41.2 KB Created: 2020-09-04 22:17:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 818b095fcd5011d0a123b3e6666725fc SHA-1: 409dca9c0b449d1be47d9644bbc7ee9385c9ffec SHA-256: 8a1403dd2a114f8fe273a7e3aea40a87620cfb70a79d62e42401f3cfff21f963
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded links, many pointing to Shopify domains hosting other PDFs, which is indicative of a link farm. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.me/wix?keyword=kalinka+sheet+music+flute'. This suggests the document is designed to lure users to malicious infrastructure, likely for phishing or distributing further malware. No scripts were extracted, and the document body was heavily obfuscated.

Heuristics 3

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.me/wix?keyword=kalinka+sheet+music+flute
    • https://cdn.shopify.com/s/files/1/0437/0048/6312/files/91447844988.pdf
    • https://cdn.shopify.com/s/files/1/0432/6077/2516/files/37689265.pdf
    • https://cdn.shopify.com/s/files/1/0434/3952/1959/files/anita_baker_songs.pdf
    • https://static.usrfiles.com/ugd/ca300b_3b407190caab48fbbeedce444ae6dbcb.pdf
    • https://static.usrfiles.com/ugd/7598fa_ca1abcf7287940749108facf3f22ab46.pdf
    • https://cdn.shopify.com/s/files/1/0437/8922/2045/files/balancing_equations_easy_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0440/8039/8486/files/poxeze.pdf
    • https://cdn.shopify.com/s/files/1/0430/3470/6069/files/horde_mage_aoe_grinding_spots.pdf
    • https://cdn.shopify.com/s/files/1/0463/8572/5595/files/a_que_lhe_teme_algum_com_astrafobia.pdf
    • https://cdn.shopify.com/s/files/1/0427/6636/8935/files/sebedugo.pdf
    • https://cdn.shopify.com/s/files/1/0433/8191/5804/files/61447543932.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000640d.bin
4187e5dd808830c6affa725f765123dca7d523ac78d963817eada0ceca16643f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x640D 5060 bytes
font_01_sfnt_off00007524.bin
9b08f6ced943d6cea78e00b7bfc9663422cfec62e28085df7f53f53bcc016dce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7524 10348 bytes

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